| 项目编号: | 1501110
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| 项目名称: | DISSERTATION RESEARCH: Do tradeoffs between water use efficiency and growth explain plant community response to nitrogen deposition? |
| 作者: | Edith Allen
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| 承担单位: | University of California-Riverside
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| 批准年: | 2014
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| 开始日期: | 2015-07-01
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| 结束日期: | 2017-12-31
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| 资助金额: | USD19749
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Biological Sciences - Environmental Biology
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| 英文关键词: | nitrogen
; nitrogen deposition
; invasive plant
; water-use efficiency
; growth
; water-use
; water
; plant growth
; many plant species
; plant trait
; important tradeoff
; invasive annual plant
; nitrogen addition
; excess nitrogen
; plant functional trait-based approach
; n deposition
; nitrogen-containing smog
; community composition
; plant diversity loss
; water use
; relative growth rate
; community-level datum
; community assembly
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| 英文摘要: | Nitrogen is a largely unrecognized component of air pollution and can negatively impact ecosystems. Excess nitrogen in the air is eventually deposited in the soil. While more nitrogen in the soil may seem beneficial for plant growth, many plant species are adapted to lower nutrient levels. Indeed, previous studies have shown that nitrogen deposition can be detrimental to ecosystem health. Southern California, which is notorious for its nitrogen-containing smog, has high levels of nitrogen deposition in the soil and many invasive plant species that also reduce native biodiversity. Nitrogen deposition may magnify the impact of invasive species because it often promotes growth of invasive annual plants over native shrubs and wildflowers. One possible explanation for the loss of native species is that added nitrogen makes them grow faster and use water less efficiently, causing them to be more susceptible to drought. Invasive plants on the other hand, may be able to grow fast with added nitrogen and still use water efficiently. The purpose of this research is to compare growth and water use by native and invasive plants under different levels of nitrogen addition. This work will lead to a better understanding of the environmental effects of nitrogen deposition, especially in dry habitats with problematic invasive species.
Identifying how trait differences between native and invasive plant species influence community composition over environmental gradients is critical to a mechanistic understanding of how ecosystems will respond to global change. Nitrogen deposition is reported as major driver of plant diversity loss, invasion and vegetation-type conversion in some areas of Europe and North America. In arid systems, nitrogen and water will have interactive effects on water-use efficiency and growth, and these responses may mediate survival. Trade-offs among plant traits, such as water-use efficiency and relative growth rate, are known to play an important role in community assembly and species coexistence. Native and invasive plants may differ in this trade-off, and added nitrogen may influence these dynamics. The use of stable isotopes (13C) for the estimation of integrated water-use efficiency in conjunction with a plant functional trait-based approach and community-level data will allow for exploration of this important tradeoff as a mechanism of invasion under N deposition. The researchers will address this hypothesis by measuring the growth and water-use efficiency of native and invasive plants along an experimental gradient in nitrogen deposition in the Santa Monica Mountains of southern California. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/94136
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Edith Allen. DISSERTATION RESEARCH: Do tradeoffs between water use efficiency and growth explain plant community response to nitrogen deposition?. 2014-01-01.
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